Flash Parameter Register - Motorola MVME162FX Programmer's Reference Manual

MC2 Chip

Flash Parameter Register

3
ADR/SIZ
BIT
NAME
OPER
RESET
3-42
The MVME162FX is populated with a 120ns Flash memory device.
Due to the wide range of Flash speeds, the contents can be changed
by software to adjust for a specific speed.
15 14 13
R R R
0 0
FWEN Flash write enable function is internal to the ASIC
for the MC2 chip. FWEN set to a 1 enables writes to
the Flash memory space. FWEN set to a 0 inhibits
writes to the Flash memory but the cycle completes
without exception.
FT2-FT0 Flash memory access time is controlled by the state
of FT2-FT0. The following table defines the FT2-FT0
encodings.
FT2-FT0
$0
$1
$2
$3
$4
$5
$6
$7
$FFF42040 (8 bits)
12 11
FWEN
R R
0 0 0
Flash Access <= N
at 25 MHz where N =
60 ns
100 ns
140 ns
180 ns
220 ns
260 ns
300 ns
340 ns
10 9 8
FT2 FT1 FT0
R/W R/W R/W
1 PL 1 PL 1 PL
Flash Access <= N
at 32 MHz where N =
40 ns
70 ns
100 ns
130 ns
160 ns
190 ns
210 ns
240 ns